Prepaid my order of 3 mags and metal mag release on 1/19/21 and received my order today. 2/6/21. All 3 mags drop when push mag release. Installing new metal mag release was a snap. Now waiting for Apex trigger-bar-and connector to be back in order for my 43x.
I have 4 of the S15 magazines for my 43x mos and 48 mos. All of them have worked flawlessly with ball and hollow point ammo.